Publications (63)
Expansion for the solutions of the Bogomolny equations on the torus
Antonio Gonzalez-Arroyo, Alberto Ramos
We show that the solutions of the Bogomolny equations for the Abelian Higgs model on a two-dimensional torus, can be expanded in powers of a quantity epsilon measuring the departur…
Study of SU(2) gauge theories with multiple Higgs fields in different representations
Guilherme Catumba, Atsuki Hiraguchi, George W. -S. Hou +5
We study two different SU(2) gauge-scalar theories in 3 and 4 spacetime dimensions. Firstly, we focus on the 3 dimensional SU(2) theory with multiple Higgs fields in the adjoint re…
Learning trivializing flows
David Albandea, Luigi Del Debbio, Pilar Hernández +3
The recent introduction of machine learning techniques, especially normalizing flows, for the sampling of lattice gauge theories has shed some hope on improving the sampling effici…
Study of 3-dimensional SU(2) gauge theory with adjoint Higgs as a model for cuprate superconductors
Guilherme Catumba, Atsuki Hiraguchi, George W. -S. Hou +5
We study a 3-dimensional SU(2) gauge theory with 4 Higgs fields which transform under the adjoint representation of the gauge group, that has been recently proposed by Sachdev et a…
Topological sampling through windings
David Albandea, Pilar Hernández, Alberto Ramos +1
We propose a modification of the Hybrid Monte Carlo (HMC) algorithm that overcomes the topological freezing of a two-dimensional gauge theory with and without fermion conten…
B form factor with 2 flavours of improved Wilson quarks
Felix Bahr, Fabio Bernardoni, John Bulava +3
The determinations of from the exclusive branching ratios of and tend to show a tension at the level of \cite{Beringer:1900zz}. On t…
On Optimality Conditions for Mathematical Programming Problems Based on Strong Subdifferentials
Felipe Lara, Alberto Ramos
We develop refined Karush-Kuhn-Tucker (KKT) and Fritz-John (FJ)-type optimality conditions for nonsmooth, nonconvex mathematical pro\-gra\-mming problems. We pay special attention…
Light quark masses in N_f = 2+1 lattice QCD with Wilson fermions
Mattia Bruno, Isabel Campos, Patrick Fritzsch +5
We present a lattice QCD determination of light quark masses with three sea-quark flavours (). Bare quark masses are known from PCAC relations in the framework of CLS la…
Charged hadrons in local finite-volume QED+QCD with C* boundary conditions
Biagio Lucini, Agostino Patella, Alberto Ramos +1
In order to calculate QED corrections to hadronic physical quantities by means of lattice simulations, a coherent description of electrically-charged states in finite volume is nee…
Non-perturbative quark mass renormalisation and running in QCD
Isabel Campos, Patrick Fritzsch, Carlos Pena +3
We determine from first principles the quark mass anomalous dimension in Nf=3 QCD between the electroweak and hadronic scales. This allows for a fully non-perturbative connection o…
Exploring Large Language Models to generate Easy to Read content
Paloma MartÃnez, Lourdes Moreno, Alberto Ramos
Ensuring text accessibility and understandability are essential goals, particularly for individuals with cognitive impairments and intellectual disabilities, who encounter challeng…
Lattice techniques to investigate the strong problem: lessons from a toy model
David Albandea, Guilherme Catumba, Alberto Ramos
Recent studies have claimed that the strong problem does not occur in QCD, proposing a new order of limits in volume and topological sectors when studying observables on the l…
Lattice investigation of the general Two Higgs Doublet Model with gauge fields
Guilherme Catumba, Atsuki Hiraguchi, George W. -S Hou +5
We study the most general Two Higgs Doublet Model with gauge fields on the lattice. The phase space is probed through the computation of gauge-invariant global observables…
Determination of in the Yang-Mills theory
Isabella Leone Zimmel, Alberto Ramos
The decoupling strategy allows one to obtain the value of the strong coupling in QCD from the running in pure gauge. Here we present our strategy to determine the running in the $S…
Lattice investigation of custodial two-Higgs-doublet model at weak quartic couplings
Guilherme Catumba, Atsuki Hiraguchi, Wei-Shu Hou +5
The gauged custodial two-Higgs-doublet model, which shares the same global-symmetry properties with the standard model, is studied non-perturbatively on the lattice. The…
Strong CP problem in the quantum rotor
David Albandea, Guilherme Catumba, Alberto Ramos
Recent studies have claimed that the strong problem does not occur in QCD, proposing a new order of limits in volume and topological sectors when studying observables on the l…
Determination of by the non-perturbative decoupling method
Mattia Dalla Brida, Roman Höllwieser, Francesco Knechtli +5
We present the details and first results of a new strategy for the determination of . By simultaneously decoupling 3 fictitious heavy quarks we establish a relation betw…
Progress in lattice simulations for two Higgs doublet models
Guilherme Catumba, Atsuki Hiraguchi, George W. -S Hou +5
The custodial Two-Higgs-Doublet-Model with SU(2) gauge fields is studied on the lattice. This model has the same global symmetry structure as the Standard Model but the additional…
Stochastic automatic differentiation and the Signal to Noise problem
Guilherme Catumba, Alberto Ramos
Lattice Field theory allows to extract properties of particles in strongly coupled quantum field theories by studying Euclidean vacuum expectation values. When estimated from numer…
The Yang-Mills gradient flow and renormalization
Alberto Ramos
In this proceedings contribution we will review the main ideas behind the many recent works that apply the gradient flow to the determination of the renormalized coupling and the r…
Improved topological sampling for lattice gauge theories
David Albandea, Pilar Hernández, Alberto Ramos +1
Standard sampling algorithms for lattice QCD suffer from topology freezing (or critical slowing down) when approaching the continuum limit, thus leading to poor sampling of the dis…
Automatic differentiation for error analysis
Alberto Ramos
We present ADerrors.jl, a software for linear error propagation and analysis of Monte Carlo data. Although the focus is in data analysis in Lattice QCD, where estimates of the obse…
Results for from the decoupling strategy
Mattia Dalla Brida, Roman Höllwieser, Francesco Knechtli +5
We present analysis details and new results for the strong coupling , determined by the decoupling strategy. We measure a massive gradient flow (GF) coupling defined in…
A non-perturbative determination of
Mattia Dalla Brida, Roman Höllwieser, Francesco Knechtli +4
Close to the continuum limit, lattice QCD with mass-degenerate Wilson quarks can be described by Symanzik's effective continuum action, which contains the dimension 5 operator, $m\…
The dependence of observables on action parameters
Guilherme Catumba, Alberto Ramos, Bryan Zaldivar
Many applications in Lattice field theory require to determine the Taylor series of observables with respect to action parameters. A primary example is the determination of electro…
The gradient flow coupling in the Schrödinger Functional
Patrick Fritzsch, Alberto Ramos
We study the perturbative behavior of the Yang-Mills gradient flow in the Schrödinger Functional, both in the continuum and on the lattice. The energy density of the flow field is…
Form factors for decays in Lattice QCD
Felix Bahr, Fabio Bernardoni, John Bulava +4
We present the current status of the computation of the form factor for the semi-leptonic decay by the ALPHA collaboration.…
Slow running of the Gradient Flow coupling from 200 MeV to 4 GeV in QCD
Mattia Dalla Brida, Patrick Fritzsch, Tomasz Korzec +3
Using a finite volume Gradient Flow (GF) renormalization scheme with Schrödinger Functional (SF) boundary conditions, we compute the non-perturbative running coupling in the range…
Non-perturbative renormalization by decoupling
Mattia Dalla Brida, Roman Höllwieser, Francesco Knechtli +3
We propose a new strategy for the determination of the QCD coupling. It relies on a coupling computed in QCD with degenerate heavy quarks at a low energy scale $…
Controlling quark mass determinations non-perturbatively in three-flavour QCD
Isabel Campos, Patrick Fritzsch, Carlos Pena +3
The determination of quark masses from lattice QCD simulations requires a non-perturbative renormalization procedure and subsequent scale evolution to high energies, where a conver…
A comparison of updating algorithms for large N reduced models
Margarita GarcÃa Pérez, Antonio González-Arroyo, Liam Keegan +2
We investigate Monte Carlo updating algorithms for simulating Yang-Mills fields on a single-site lattice, such as for the Twisted Eguchi-Kawai model (TEK). We show that per…
Systematic errors in partially-quenched QCD plus QED lattice simulations
Antonin Portelli, Stephan Dürr, Zoltán Fodor +9
At the precision reached in current lattice QCD calculations, electromagnetic effects are becoming numerically relevant. Here, electromagnetic effects are included by superimposing…
Toward the End-to-End Optimization of Particle Physics Instruments with Differentiable Programming: a White Paper
Tommaso Dorigo, Andrea Giammanco, Pietro Vischia +33
The full optimization of the design and operation of instruments whose functioning relies on the interaction of radiation with matter is a super-human task, given the large dimensi…
Playing with the kinetic term in the HMC
Alberto Ramos
The HMC algorithm, combining the advantages of molecular dynamics and Monte-Carlo methods, is the most efficient algorithm to simulate QCD including the effects of sea quarks. In t…
openQ*D simulation code for QCD+QED
Isabel Campos, Patrick Fritzsch, Martin Hansen +4
The openQ*D code for the simulation of QCD+QED with C boundary conditions is presented. This code is based on openQCD-1.6, from which it inherits the core features that ens…
Determination of the QCD -parameter and the accuracy of perturbation theory at high energies
Mattia Dalla Brida, Patrick Fritzsch, Tomasz Korzec +3
We discuss the determination of the strong coupling or equivalently the QCD -parameter. Its determination requires the use of pertu…
A status update on the determination of by the ALPHA collaboration
Mattia Dalla Brida, Patrick Fritzsch, Tomasz Korzec +3
The ALPHA collaboration aims to determine with a total error below the percent level. A further step towards this goal can be taken by combining results from the recent…
An analysis of systematic effects in finite size scaling studies using the gradient flow
Alessandro Nada, Alberto Ramos
We propose a new strategy for the determination of the step scaling function in finite size scaling studies using the Gradient Flow. In this approach the determination of $…
On O() effects in gradient flow observables
Alberto Ramos, Stefan Sint
In lattice gauge theories, the gradient flow has been used extensively both, for scale setting and for defining finite volume renormalization schemes for the gauge coupling. Unfort…
Dynamics of critical vortices on the torus and on the plane
Antonio Gonzalez-Arroyo, Alberto Ramos
We use the Bradlow parameter expansion to construct the metric tensor in the space of solutions of the Bogomolny equations for the Abelian Higgs model on a two-dimensional torus. U…
The SU(N) running coupling in the twisted gradient flow scheme and volume independence
Jorge Luis Dasilva Golan, Margarita Garcia Perez, Alberto Ramos
We report on an ongoing study of the running coupling of SU(N) pure Yang-Mills theory in the twisted gradient flow scheme (TGF). The study exploits the idea that twisted boundary c…
Lattice determinations of the strong coupling
Luigi Del Debbio, Alberto Ramos
Lattice QCD has reached a mature status. State of the art lattice computations include (and even the ) sea quark effects, together with an estimate of electromagnetic an…
The twisted gradient flow running coupling in SU(3): a non-perturbative determination
Eduardo I. Bribian, Margarita Garcia Perez, Alberto Ramos
We report some preliminary results of our ongoing non-perturbative computation of the twisted 't Hooft running coupling in a particular set-up, using the gradient flow to define th…
Non-perturbative running of quark masses in three-flavour QCD
Isabel Campos, Patrick Fritzsch, Carlos Pena +3
We present our preliminary results for the computation of the non-perturbative running of renormalized quark masses in QCD, between the electroweak and hadronic scales, u…
50 Years of Quantum Chromodynamics
Franz Gross, Eberhard Klempt, Stanley J. Brodsky +92
This paper presents a comprehensive review of both the theory and experimental successes of Quantum Chromodynamics, starting with its emergence as a well defined theory in 1972-73…
The Yang-Mills gradient flow and SU(3) gauge theory with 12 massless fundamental fermions in a colour-twisted box
C. -J. David Lin, Kenji Ogawa, Alberto Ramos
We perform the step-scaling investigation of the running coupling constant, using the gradient-flow scheme, in SU(3) gauge theory with twelve massless fermions in the fundamental r…
A non-perturbative exploration of the high energy regime in QCD
Mattia Dalla Brida, Patrick Fritzsch, Tomasz Korzec +3
Using continuum extrapolated lattice data we trace a family of running couplings in three-flavour QCD over a large range of scales from about 4 to 128 GeV. The scale is set by the…
SU(3) gauge theory with 12 flavours in a twisted box
C. -J. David Lin, Kenji Ogawa, Hiroshi Ohki +2
We present preliminary result for the step-scaling study of the coupling constant with the Yang-Mills gradient flow, in the twelve-favour SU(3) gauge theory. In this work, the latt…
A Julia Code for Lattice QCD on GPUs
Guilherme Catumba, Fernando P. Panadero, Carlos Pena +1
We present a new GPU-based open source package to perform Lattice simulations developed in Julia. The code currently supports generation of SU(2) and SU(3) (pure gauge) configurati…
Learning Trivializing Flows in a theory from coarser lattices
David Albandea, Luigi Del Debbio, Pilar Hernández +3
The so-called trivializing flows were proposed to speed up Hybrid Monte Carlo simulations, where the Wilson flow was used as an approximation of a trivializing map, a transformatio…
Studying the gradient flow coupling in the Schrödinger functional
Patrick Fritzsch, Alberto Ramos
We discuss the setup and features of a new definition of the running coupling in the Schrödinger functional scheme based on the gradient flow. Its suitability for a precise contin…
The gradient flow coupling at high-energy and the scale of SU(3) Yang-Mills theory
Mattia Dalla Brida, Alberto Ramos
Using finite size scaling techniques and a renormalization scheme based on the Gradient Flow, we determine non-perturbatively the -function of the Yang-Mills theory for…
Lattice study for conformal windows of SU(2) and SU(3) gauge theories with fundamental fermions
Cynthia Y. -H. Huang, Issaku Kanamori, C. -J. David Lin +4
We present our investigation of SU(2) gauge theory with 8 flavours, and SU(3) gauge theory with 12 flavours. For the SU(2) case, at strong bare coupling, , the dis…
Lattice study of SU(2) gauge theory coupled to four adjoint Higgs fields
Guilherme Catumba, Atsuki Hiraguchi, Wei-Shu Hou +5
Gauge theories with matter fields in various representations play an important role in different branches of physics. Recently, it was proposed that several aspects of the interest…
Stochastic automatic differentiation for Monte Carlo processes
Guilherme Catumba, Alberto Ramos, Bryan Zaldivar
Monte Carlo methods represent a cornerstone of computer science. They allow to sample high dimensional distribution functions in an efficient way. In this paper we consider the ext…
Critical slowing down and the gradient flow coupling in the Schrödinger functional
Patrick Fritzsch, Alberto Ramos, Felix Stollenwerk
We study the sensitivity of the gradient flow coupling to sectors of different topological charge and its implications in practical situations. Furthermore, we investigate an alter…
openQ*D code: a versatile tool for QCD+QED simulations
Isabel Campos, Patrick Fritzsch, Martin Hansen +4
We present the open-source package openQ*D-1.0, which has been primarily, but not uniquely, designed to perform lattice simulations of QCD+QED and QCD, with and without C* boundary…
Automatic differentiation for error analysis of Monte Carlo data
Alberto Ramos
Automatic Differentiation (AD) allows to determine exactly the Taylor series of any function truncated at any order. Here we propose to use AD techniques for Monte Carlo data analy…
(Dimensional) twisted reduction in large N gauge theories
Liam Keegan, Alberto Ramos
We show that the spontaneous breaking of center symmetry can be avoided on a lattice with the appropriate choice of twisted boundary conditions. In order for this t…
Memory efficient finite volume schemes with twisted boundary conditions
Eduardo I. Bribian, Jorge Luis Dasilva Golan, Margarita Garcia Perez +1
In this paper we explore a finite volume renormalization scheme that combines three main ingredients: a coupling based on the gradient flow, the use of twisted boundary conditions…
Learning Trivializing Flows
David Albandea, Luigi Del Debbio, Pilar Hernández +3
The recent introduction of Machine Learning techniques, especially Normalizing Flows, for the sampling of lattice gauge theories has shed some hope on improving the sampling effici…
The determination of by the ALPHA collaboration
Mattia Bruno, Mattia Dalla Brida, Patrick Fritzsch +6
We review the ALPHA collaboration strategy for obtaining the QCD coupling at high scale. In the three-flavor effective theory it avoids the use of perturbation theory at …
The strength of the interaction between quarks and gluons
Mattia Dalla Brida, Roman Höllwieser, Francesco Knechtli +4
Modern particle physics experiments, e.g. at the Large Hadron Collider (LHC) at CERN, crucially depend on the precise description of the scattering processes in terms of the known…